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    Subject[PATCH 4.14 089/115] drm/edid: Add 6 bpc quirk for SDC panel in Lenovo B50-80
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Kai-Heng Feng <kai.heng.feng@canonical.com>

    commit 25da75043f8690fd083878447c91f289dfb63b87 upstream.

    Another panel that reports "DFP 1.x compliant TMDS" but it supports 6bpc
    instead of 8 bpc.

    Apply 6 bpc quirk for the panel to fix it.

    BugLink: https://bugs.launchpad.net/bugs/1788308
    Cc: <stable@vger.kernel.org> # v4.8+
    Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
    Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
    Link: https://patchwork.freedesktop.org/patch/msgid/20180823055332.7723-1-kai.heng.feng@canonical.com
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/gpu/drm/drm_edid.c | 3 +++
    1 file changed, 3 insertions(+)

    --- a/drivers/gpu/drm/drm_edid.c
    +++ b/drivers/gpu/drm/drm_edid.c
    @@ -114,6 +114,9 @@ static const struct edid_quirk {
    /* CPT panel of Asus UX303LA reports 8 bpc, but is a 6 bpc panel */
    { "CPT", 0x17df, EDID_QUIRK_FORCE_6BPC },

    + /* SDC panel of Lenovo B50-80 reports 8 bpc, but is a 6 bpc panel */
    + { "SDC", 0x3652, EDID_QUIRK_FORCE_6BPC },
    +
    /* Belinea 10 15 55 */
    { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 },
    { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 },

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